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Message-ID: <Y9fL6gc4gZlQSzht@nvidia.com> Date: Mon, 30 Jan 2023 09:53:46 -0400 From: Jason Gunthorpe <jgg@...dia.com> To: Robin Murphy <robin.murphy@....com> Cc: Baolu Lu <baolu.lu@...ux.intel.com>, joro@...tes.org, will@...nel.org, hch@....de, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/8] iommu: Decouple iommu_present() from bus ops On Mon, Jan 30, 2023 at 01:49:20PM +0000, Robin Murphy wrote: > All in all, it's only actually the habanalabs ones that I'm slightly wary > of, since they're effectively (mis)using device_iommu_mapped() to infer the > DMA ops implementation, which could potentially go wrong (or at least *more* > wrong) on POWER with this change. I guess the saving grace is that > although IMHO habana is not using the DMA API abstraction properly. If it doesn't work on some archs is their bugs to deal with - we don't need to complexify the core code to tiptoe around around such an abuse in an obscure driver. Jason
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